################################################################################
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#
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# toolchain
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#
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################################################################################
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ifeq ($(BR2_TOOLCHAIN_BUILDROOT),y)
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TOOLCHAIN_DEPENDENCIES += toolchain-buildroot
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else ifeq ($(BR2_TOOLCHAIN_EXTERNAL),y)
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TOOLCHAIN_DEPENDENCIES += toolchain-external
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endif
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TOOLCHAIN_ADD_TOOLCHAIN_DEPENDENCY = NO
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TOOLCHAIN_INSTALL_STAGING = YES
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# Apply a hack that Rick Felker suggested[1] to avoid conflicts between libc
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# headers and kernel headers. This is needed for kernel headers older than
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# 4.15. Kernel headers 4.15 and newer don't require __GLIBC__ to be defined.
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#
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# Augment the original suggestion with __USE_MISC since recent kernels
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# (older than 4.15) require this glibc internal macro. Also, as musl defines
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# IFF_LOWER_UP, IFF_DORMANT and IFF_ECHO, add another macro to suppress
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# them in the kernel header, and avoid macro/enum conflict.
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#
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# Kernel version 3.12 introduced the libc-compat.h header.
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#
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# [1] http://www.openwall.com/lists/musl/2015/10/08/2
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ifeq ($(BR2_TOOLCHAIN_USES_MUSL)$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_3_12):$(BR2_TOOLCHAIN_HEADERS_AT_LEAST_4_15),yy:)
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define TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
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$(SED) 's/^#if defined(__GLIBC__)$$/#if 1/' \
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$(STAGING_DIR)/usr/include/linux/libc-compat.h
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$(SED) '1s/^/#define __USE_MISC\n/' \
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$(STAGING_DIR)/usr/include/linux/libc-compat.h
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$(SED) '1s/^/#define __UAPI_DEF_IF_NET_DEVICE_FLAGS_LOWER_UP_DORMANT_ECHO 0\n/' \
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$(STAGING_DIR)/usr/include/linux/libc-compat.h
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endef
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TOOLCHAIN_POST_INSTALL_STAGING_HOOKS += TOOLCHAIN_MUSL_KERNEL_HEADERS_COMPATIBILITY_HACK
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endif
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# Install default nsswitch.conf file if the skeleton doesn't provide it
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ifeq ($(BR2_TOOLCHAIN_USES_GLIBC),y)
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define TOOLCHAIN_GLIBC_COPY_NSSWITCH_FILE
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@if [ ! -f "$(TARGET_DIR)/etc/nsswitch.conf" ]; then \
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$(INSTALL) -D -m 0644 package/glibc/nsswitch.conf $(TARGET_DIR)/etc/nsswitch.conf ; \
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fi
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endef
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TOOLCHAIN_POST_INSTALL_TARGET_HOOKS += TOOLCHAIN_GLIBC_COPY_NSSWITCH_FILE
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endif
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$(eval $(virtual-package))
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